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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
Hi.. Just had a thought. The physical resolution on a typical CMOS colour camera is basically 3* that of a B/W right?
So is there any reason why I can't dissolve the filter off the top of the chip to expose the bare sensor and therefore make a higher resolution detector for sensing radiation?
obviously what I will get is flashing coloured pixels instead of B/W but this shouldn't be a problem.
Am thinking hot acetone/etc or some combination of solvents.
This might also work for night vision etc as a lot of light is lost (2/3 or more per pixel) which is why they have a higher lux rating.
Registered Member #3761
Joined: Tue Mar 15 2011, 12:29AM
Location: Toronto, Canada
Posts: 15
I think that would work I've been looking at one. Im guessing you mean the top 2 layers like in this diagram http://www.photoaxe.com/wp-content/uploads/2007/04/camera-sensor.jpg make sure you update with your results. you'll have to be careful not to scratch it, you may need to start using a diluted solution so you don't ruin the sensor. I could attempt it too.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
Start by understanding that B/W and colour sensors are identical, it is only the colour filter and algorithms that are different. The radiation will pass through the colour filter so nothing will happen if you remove the filter. Look up Bayer filter to get the idea.
It is true that the filter will absorbe most of the light. You will ruing many colour cameras before you get the hang of it so why not buy a bucket full of B/W cameras instead.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
I have some B/W cameras here which, however it would be interesting to see if a mobile phone camera can be modified in this way as it would substantially increase its low light level response as well.
Also, it appears that colour filters do substantially decrease the number of alpha particles hitting the sensor at least when I tested this with a cheap webcam, unless your own experiments revealed any difference.. ? Compared with a B/W there are only a few spots per second instead of a hailstorm even with the glass removed.
see for someone else's experiments along these lines. It also appears that the type of camera also affects the results, as does changing the clock frequency. Decreasing it from 13.5 to 4 MHz nearly triples the sensitivity, even showing what appears to be different pulse heights corresponding to both gamma and alpha detections.
Registered Member #65
Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
I like the idea if it works, as one could try it with a cheap ~16.1 Megapixel camera for a amateur Telescope project. (~48.3 Megapixel sensor for under $100.)
The filter removal may require pixel-level exposure correction with post processing... depending on the camera driver options disabling auto-exposure and anti-blooming will likely be needed too.
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Dissolve colour filter on CMOS camera?
